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Rule of 2-3-4 - Based on Ely Culbertson's preemptive bidding methods, hand evaluation based on the number of anticipated losers in relation to the aggregate vulnerability.  Perhaps preemptive opener is considering a preemptive bid with 7 losers, uncertain of how high to make the preemptive call:

Anticipated
Winners
Vulnerability Bidding
Factor
Calculation
6 Favorable
(only opponents Vulnerable)
4 6+4=10
Bid at 4 level
6 Neutral
(both Vulnerable or
Non-Vulnerable)
3 6+3=9
Bid at 3 level
6 Unfavorable
(only opponents
Non-Vulnerable)
2 6+2=8
Bid at 2 level

Also see Environmental Factors

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